Developed a loud "screech" noise when I shut the engine off. Can't determine what it may be from. Any ideas?

Have been fighting some coolant leaks since replacing my injectors (and other work). Seems the old hoses and "spring" clamps don't like to be disturbed. I guess the hoses develop a memory of where those spring clamps were and you need to put them back on in the same position. Even then I've had some issues. Replaced the upper radiator hose and started replacing the "spring" clamps with "worm gear" clamps. Still to be determined if the leaks have been fixed.

Also just noticed a lot of smoke/steam coming out of the exhaust for a good minute or so after turning the engine off. Actually, only the right stack which is closer to the elbow and exhaust pipe. Don't recall seeing that before. It is cold out so that makes it more visible but now I'm thinking EGR cooler (ie. coolant in exhaust.)

Seems to be putting out a good haze when I start it and let it idle too. Again, it is cold out, and I notice this at night with some background light so it does make it more visible.

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